A). Some percentage of his public persona is "show"....acting tough, brash, crazy, reckless...whatever you want to call it. What percent is it? 5%, 50%, 90%? hard to say.

B). I would not be surprised at all if Trump has narcissistic personality disorder, or other borderline issues. HOWEVER, I am sure that Clinton, and most others at high levels of government have psychological problems/issues. It is not at all unique to him.

With all due respect, if one has not read the book then one cannot judge.

There are patterns of human behaviour that are powerful models. Sociopaths, narcissists, etc. Trump is an outlier and worth studying, politics aside.

I wasn't judging. I started my comment about the book with "I suspect this book probably ...". I know nothing of this book, but I do have my suspicions.

All presidents are outliers and they are all sociopaths and narcissists to one extent or another. What is different about Trump is that he might not be as bright as most of his predecessors, he really doesn't care to behave like he's "supposed to", he has no interest in pretending to play the game, and he really enjoys going out of his way to say things that the liberal elites will get outraged about. On that last point I have no doubt at all that he does this on purpose and enjoys it immensely. The Pocahontas comment this week was great.